3448307 - SAP Cloud connector -FAILED: request failed: rc=1, msg="[RFC] error open connection: NIECONN_BROK reported from SAP Data Intelligence

A SAP Data Intelligence graph connects to ABAP backend system via cloud connector by using a RFC connection.

When DI (Data Intelligence ) triggers a large number of connection requests within a short period of time, the following error may appear in DI end:

"ABAP connector(Axino) ABAP connection check FAILED: request failed: rc=1, msg="[RFC] error open connection: NIECONN_BROKEN : unable to receive data from connectivity-proxy-service:20001. Please refer to SAP Note 2849542 for more information" Please refer to SAP Note 2849542 for more information."

The below error In the cloud connector trace. 

2024-03-21 13:49:36,927 +0000#DEBUG#com.sap.scc.protocol.rfc#tunnel-client-23-6#0x066ca74f#Queue [1843989427, 1] changed in addPayload: [UnpooledSlicedByteBuf(ridx: 0, widx: 119, cap: 119/119, unwrapped: PooledUnsafeDirectByteBuf(ridx: 14, widx: 133, cap: 133))]; added 119 bytes, id:711334110
2024-03-21 13:49:36,927 +0000#ERROR#com.sap.core.connectivity.tunnel.core.impl.processing.OutboundPacketProcessor#tunnel-client-23-6#0x066ca74f#Internal error
java.util.concurrent.RejectedExecutionException: Task com.sap.scc.protocol.rfc.RfcProtocolProcessorRunnable@xxxx rejected from java.util.concurrent.ThreadPoolExecutor@xxxx[Running, pool size = 100, active threads = 100, queued tasks = 0, completed tasks = 67508288]

SAP Cloud Connector 2.15.2 - 2.18.

 rc=1, msg="[RFC], error open connection: NIECONN_BROK, SCC, DI , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , CA-DI-IS-ABA , ABAP Integration , Problem